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Proceedings Paper

Encoding true color images in true color difference mode (TCDM)
Author(s): C. H. Lee; Yiu Keung Chan; M. F. Chang; A. T.F. Wong
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Paper Abstract

24-bit color display capability is gradually becoming the standard over 256K or 64K color displays on graphics workstations. Some main problems associated with this trend are the dramatic increase in memory storage requirement and the bandwidth requirement. This paper describes the operation of a new 4:1:1 True Color Difference Mode (TCDM) color image encoding scheme which encodes information in differences. This method can display near true color quality images while the memory requirement is reduced by two-third (i.e. 4 bytes for a set of 4 pixels). The exceptionally simple hardware required to implement the real-time decoding of this scheme is also presented. Nonlinear quantization and the use of differential encoding scheme enables the encoded data to emulate the original data. Visually, it is not possible to detect any difference between test pictures encoded with 24 bits/pixel and that encoded with TCDM using only 4 bytes to represent a set of 4 pixels.

Paper Details

Date Published: 10 April 1995
PDF: 6 pages
Proc. SPIE 2414, Device-Independent Color Imaging II, (10 April 1995); doi: 10.1117/12.206549
Show Author Affiliations
C. H. Lee, City Polytechnic of Hong Kong (Hong Kong)
Yiu Keung Chan, City Polytechnic of Hong Kong (Hong Kong)
M. F. Chang, City Polytechnic of Hong Kong (Hong Kong)
A. T.F. Wong, City Polytechnic of Hong Kong (Hong Kong)


Published in SPIE Proceedings Vol. 2414:
Device-Independent Color Imaging II
Eric Walowit, Editor(s)

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